I'm not a fan of George Perez' art. I don't think it's bad or that he's a poor artist, it's perfectly serviceable, for sure, and he can definitely tell a story effectively.
His art just isn't expressive or painterly. It's not exciting to me at all, it's just functional and feels like a dated house style (which it more or less is). I'd never pick him if I had a choice of artists when there are more expressive talents available. I personally would have liked to see Dustin Nguyen or someone like that on this book.